If the Form 1099-K is issued in your Social Security Number, you can report the amount shown on the Form 1099-K in the Form 1099-K section under Other Common Income, then check the box "This amount in box 1a is too high or includes some personal transactions" and enter the amount that shouldn't be included in the box that appears.
An alternative method is to report the full amount of the 1099-K in the 1099-K section, then enter the incorrect amounts as separate entries under Less Common Income, then Miscellaneous Income, then Other income not reported on a form. Report the incorrect items as negative numbers, and thereby deduct the incorrect income. That way, your income reported from a Form 1099-K will match what was reported to the IRS so that their matching system doesn't show a discrepancy.
See this IRS FAQ for more information regarding Form 1099-K.
See this TurboTax article for more information on 1099-Ks received for other than self-employment income.
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